Improved drill



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C. IV. LE COUNT, OF NORWALK, CONNECTICUT.

Leum Patent No. 85,107, dai-ai December 22, 186s.

IMPRAOVED DRILL.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom fit may concern Be it known that I, C. W. LE COUNT, of Norwalk, in the county of Fairfield, and State of Connecticut, have invented a new and useful Improvemeutin Boring- 'lools; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.`

This invention relates to a useful improvement inV tools for boring metals; and

It consists in grooviug the sides of the drills for boring metals', ywhereby they are made to operate more per fectly, and with much greater ease than ordinary boring-tools.

In the accompanying plate of drawiugs- Figure 1 is a longitudinal side view of a drill for'boring iron and other metals, constructed according to my invention.

Figure 2 is an end View, showing the form of the cutting-edges.

Figiu'e 3ds a cross-section (enlarged) through the line a: x of fig. 1.

Similar letters of reference indicate corresponding Darts.

'This drill is made ot'y any suitable length and size.

Upon each of the sides there is a principal groove, indicated in the drawing by a..

Itwill be seen 4that these grooves are not opposite each other, but that an angular cutting-lip is formed on each side of the centre of lthe -drillLand at an angle to the ordinary cutting-edge of the drill of about fortyive degrees.

v. These grooves extend as far up the sides of -the drill as may be desired.

c c, g. 3,1'epresei1t these angular cutting-lips; and

d d, the cutting-edges of thc ordinary drill for boring iron.

In each oi the cutting-edges d d, it will be seen that there are other grooves'e, the position of which on the.

opposite sides of the drill vaiies, as seen in the drawing.

In boring with the drill thus grooved, ridges will be left by these small groovese', as thedrill is revolved, but the grooves being placed so that they do not travel in each others track, the ridges of one pair of grooves will be cut out by the cutting-edges between the grooves of' the other cutting-lip, and so on alternately, one lip cutting the ridges left lby the other.

By this zurangement, the 'chi'psa're so out up, that the drill is prevented from choking or clogging.

A drill formed with the angular cutting-lips c and grooves c, requires much less pressure and much less' power to bore iron than the v common dat or the twist drill.

The outer angles of the cutting-lips c form an une erring guide for guiding 'the drill, which, of itself, is a matter of the greatest importance in performing work accurately.

These lips c, unlike the lips of the ordinary drill, cut to the centre of the hole; consequently the centre of. ythe drill does not have to be forced, iu boring, like that of the ordinary drill. y I,

I do not confine myself to (hills for boring metals in the use of the grooves. v

` In experimenting with angers and auger-bits, in bor-- ing hard wood, I have found that such angers and bits Work much easier when grooves or nicks are cut in their cutting-lips, so that the chip maybe cut up,and be dischargedby the spiral pod, without clogging,- and I contemplate applying this improvement to angers and hits for boring wood, as well as to drills for drilling-iron.

Having thus described my invention,

What I claim as my improvement in drills, is

1. Forming the two wings of the drill in parallel but different planes, so that the cutting-edge on each shall be in advance ofthe centre of rotation, and that the portion inte-Welling, or that which unites the said Wings of substantially the same thickness of metal, shall present cutting-edges at an angle of about forty-five degrees to the lcutting-edges of the Wings, substantiallyr as described. 2. 'The longitudinal grooves a u, in the re-entering angles formed bythe wing and intervening or central portion, substantially as described. A l i 3. The longitudinal grooves e e, formed in the sur` face of the drill, as described.

The above specification of my invention signed by me, this 7th day of October, 1868.

C. W. LE GOUNI.- Witnesses: FRANK BLOGKLEY, ALEX. F. RoBnn'rs. 

